SU120581A1 - Evaporative cooling system for turbogenerator rotors - Google Patents

Description

It is well known that creating turbogenerators with a capacity of not, how many hundreds of thousands of kilowatts causes great difficulties associated with the need to ensure sufficiently intensive cooling of the rotor and stator of the turbogenerator, since increasing the power of the machine requires increasing the heat removal from the surface unit of its active parts accordingly.

A currently adopted hydrogen cooling system can be used in turbo generators with a capacity of up to 300–320 MW. With a further increase in power, it is necessary to switch to the evaporative cooling system with the supply of easily evaporating liquid directly to the rotor winding. Contacting copper directly, this liquid will evaporate and remove the heat generated in the winding. With such a cooling system, the heat transfer coefficient from the surface of copper increases hundreds of times compared to conventional cooling and can reach 10,000-30000 - -

The cooling liquid used for evaporative cooling cncTe.ie must meet certain requirements: its boiling point must not exceed the permissible overheating values for the existing insulation classes, it must be inert with respect to metals, have high dielectric strength and large latent heat of vaporization.

In the proposed system, dichloromethane (CH2C, l2) is used as such a liquid. The boiling point of dichloromethane at atmospheric pressure is - - 40 ° C, the heat of vaporization is hidden

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about 7,2. Dichloromethane is very resistant to acids, shello, metals and insoluble in water; It does not act on copper and latuk. Dichloromethane has a high dielectric strength as

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No. 120581

in liquid and vapor phase. In order to cool the rotor winding of a 500 mgwg turbogenerator, about 6.5 kg of dichloromethane need to be fed into the rotor per second.

In addition, the proposed system provides a supply of coolant to the rotor winding and removal of the generating steam from it during POMMONI pidazovy channels, which are divided by axial baffles and two parts, 3 x 5 x part is intended to supply winding, and the top - for removal from her steam.

FIG. 1 cuts a rods section of a turbogenerator rotor with a vacuum, and is equipped with a cooling system and; in fig. 2 - s / of the rotor slot.

Coolant is supplied to the rotor of the turbo generator through the hole; tp / into its shaft, then enters the collector 2 ntc) and is distributed on the lower part 5 of the sub-channel channels. The upper part 4 of the sub-channel channels serves to reverse the vaporous agent. Parts 3 and 4 of the sub-channel channels are separated from each other by axial b Ми mi partitions. K. the winding of the rotor is cooled; liquid is supplied equal to the number | about the whole orbit. Dichloromethane in the groove occupies space 5 (. 2), images; 1 P OO two pds;. N:. turns 6.

In order to eliminate the interconnection of coils, which are smaller than P1YX in pp., Separate knots of rasklinetz nzolionnymi distantam strut 7, which are installed at a distance of 150-250 mm from each. A part of these struts, a passage through the frame insulator 1, juncture of the groove, comes to the lower part of the 3rd section; with cooled liquid o. In the struts 7, holes 1–8 are made for the passage of fluid from the lower part of the sub-drip to the top of the coil windings. In all struts 7, installed in both the first and the frontal parts of the winding, there are holes 9 to provide the possibility of some neretek n-1 fluid from one compartment to another. I will cool the frontal joints; the liquid will stay at the same path through the holes in the inter-turn struts 10, heat will be removed from the upper turns and liquid will be removed from the other turns by steam, which forms when the liquid is boiling. This steam will be tightly pressed from the IAZ to the subpasonic channel, since by the action of centrifugal forces cool liquid will tend to fill the space at the upper turns. Through the sub-channel channels, the pairs will pass to the frontal joints and from there through the hole 1 in the center. ko, bandage in cooling 1tls, where dichloromethane, which hell, turns into a liquid.

At application of the proposed cooling system. the rotor 12 of the turbogenerator will rotate in pairs of dichloromethane, the density of which is 2.93 times the large p .; from 1 air In order to reduce the losses ia of the friction of the rotor against the vaporous dichlorometap, in the air gap it is necessary to create a discharge of the order of 0.1 at. This cooling system of the impeller rotor can be dangerous if it drains the liquid into the gap, since there immediately turn into steam.

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Claims (3)

1. An evaporator 1a, a system for cooling the rotors of a turbo-generator with the supply of an easily evaporating liquid and directly to the winding of the rotor and its discharge from the rotor into steam, so that, in order to increase the cooling efficiency, as a coolant; 1 t-1 is 5 dichlormsta. 2. The evaporative cooling system according to claim 1, in which the vaporizing liquid is supplied to the winding but nodpazovym channels, characterized in that, in order to separate the supplied coolant from the heated steam, the channels are divided by axial partitions (wedges) into two parts of which the lower one is used to supply liquid to the winding, and the upper one to remove steam from the winding. 3. Evaporative system according to paragraphs. 1 and 2, characterized in that for supplying coolant from the slot portion of the winding to the frontal connections, openings are provided in the inter-turn spacers.